Blood-pressure gage.



A. ROESCH.

BLOOD PRESSUREGAGE.

APPLICATION FILED JUNE 30. 1912.

1,282,632.. Patented Oct. 22, 1918.

i I 11111111111111] WITNESSES MENTOR I aim; W

A TTOR/VEKS' nrr s ra ns rarnnir ALFRED ROESGH, OF BROOKLYN, NEW YORK, ASSIGNOR T0 CHARLES J.

TAGLIABUE MANUFACTURING 00., 0F BROOKLYN, NEW YORK, A CORPORATION OF NEW YORK.

BLOOD-PRESSURE GAGE.

Specification of Letters Patent.

Application filed June 30, 1917. Serial No. 178,022.

To all whom it may concern:

Be it knownthat I, ALFRED RonsoH, a citizen of the United borough of Brooklyn, county of Kings, city and State of New York, have invented certain new and useful Improvements in Blood- Pressure Gages, of which the following is a specification. I

My invention relates to gages of the type commonly known as blood pressure gages and has for its object to produce an instrument which is simplein construction, cheap and easy to produce and in which the necessity for particularly accurate work during manufacture is avoided. My invention further strument of the indicated type which is extremely sensitive, even to a small fraction of a millimeter of mercury, which will produce and repeat accurate readings and in which inaccuracies in operation are immediately indicated. My invention will be fully described hereinafter and the features of novelty will be pointed out in the appended claims. i

In the accompanying drawings, which show an example of my improvement, Figure 1 is a front elevation partly in section; Fig. 2 is a detail view on an enlarged scale and Fig. 371s a detail side View also on an enlarged scale.

As shown in the illustrated example the instrument comprises a casing 5 constructed of suitable material and preferably in the form of a quadrant; that is the side walls 5 of said casing diverge upwardly and are connected by a curved top wall 5 the front wall 5 and rear wall 5 being substantially parallel with each other. The casing 5 is secured to and extends upwardly from a lower sec tion 6 which is preferably cylindrical in form, said casing 5 at its lower end being formed with an opening located in registry with an opening in the top of the section 6 whereby communication between the interiors of the casing 5 and section 6 is established. The lower end of the section 6 is closed by means of a closure 7 whichvmay be frictionally held in position or otherwise secured as may be desired and which carries an upright yoke 8, the latter preferablyforming an integral part. of said closure.

The closure 7 also supports a bellows 9 of any well known or suitable construction and secured in position, for instance, by means States, and resident of the contemplates the provision of an inof a screw-threaded neck 10 which screws into a screw-threaded opening in the closure 7 and is of such a length as to project some what beyond the same. The projecting portion of the neck 10 may be used as a means whereby a nipple 11 is operatively combined with the instrument, it being understood that the neck 10 is tubular, thus establishing communication between the interior of the bellows 9 and the nipple 11; The arrangement may further include a screw-threaded stem 12 having its one end suitably secured to the bellows 9 and extending through the neck 10 into the nipple 11. The stem 12 carries a nut 13 which cooperates, for instance, with the inner end of the nipple 11 to limit the expansion of the bellows and which may be adjusted upon said stem to vary the point at which said expansion is arrested.

The yoke 8 supports a frame 14 having up right members 15, 15 and 15 spaced from each other as shown in Fig. 2. An indicating hand 16 is carried by a spindle 17 rotatably mounted between the members 15 and 15*, the hand 16 being formed at its lower end with an extension 18 extending at an angle to said hand and carrying a counter weight 19. The hand 16 is further provided at a lower end with a member 20 extending at an angle in a direction opposite to that of the arm 18 and arranged in surface engagement with an adjustable member 21. The latter extends transversely across the lower end of the hand 16 and is provided with a slot 22 for the accommodation of the spindle 17 and of a screw 23 whereby the members 20' and 21 are operatively connected to each other. A link 24 has its one end pivotally connected at 25 with the member 21 and at its other end is provided with a slot 26 through which a pivot pin 27 passes loosely. The latter is carried by an arm 28 and constitutes a loose pivotal connection between said link 24 and the arm 28 which in the illustrated example forms part of and inclines upwardly from a plate or the like .29 secured to the upper end of the bellows 9 -1n any sultable manner as by means of a .33. The scale as shown is graduated in millimeters of mercury and in the illustrated can to 260 millimeters of mercury as shown in Fig. 1. In its position of rest the indicating hand 16 is'in registry with the scale indication 60 and rests against a stud or stop 84: located at the,proper point upon the scale plate 32, said hand 16 being ample ranges from held in this positionby the action of the counter-Weight 19.

The instrument further;includes;a correction or zero hand which in combination with a zero indication or other designation 36produced onthe scale plate'32,eindicates wh etherthe instrument true audits readings are correct or not. The hand 35 is carried by'a spindle 37 ]OL1'1'I1t1lG(lElDQbWGGllthe members 15" and 15 of theirame 14 at a point above the: axis ofthespindle 17. The

hand35 is .fOl'lllGd'Etl) its lower-end with a member: 38 which extends at anangle to said hand and in the illustrated example is continued in'the form oian extension 39 car-- edges of the plate or the like 29andincline upwardly 1n opposite directions tit'rom. oppo- -s1teendsof said plate sowas toappear to intersect each other when viewed ifrom the frontier rear.

In practice, vthe instrument being properly adjusted and atrest with .the zbellows in proper cooperative condition, the indicat- :ing' hand 16 restsagainst the Stud 31 with its free-end m l'egistrywvitli the scale indicat1on 160, belng maintalned in 'flllS iposltion by the. counter-weight 19. =In:this condition of the instrument the 'pivot27 :is .near the lower end or at an intermediatepoint oi the slot 26 of the link 2t as shown in Figs. 1

:and 3. Thezero or correction hand 35ibeing 111 fixed conuectlon with the bellows 9 through themedium of bh81111lk -11'is held thereby in registry withthedesignation'36 thus indicating thatthe instrument is true and improper Working condition. T he nip- :ple '11is connected by means of amuhber tubing or theilike with thelusual blood pressure =test1ng arrangement, '11 Ebemg under- StOOdit-llitt the connection with the human being may be of any usual type.

i As *the :bellows 9 expand under inflation, as-:the instrument is operatively used, an upward pressure is immediately exerted upon thelink 1-1 which is communicated to -the-memberl38 and causcs=the zero hand 35 to swing'awav from the designation 36 toward theileft in the illustrated example.

The expansion of the bcllows9 alsocauses the pivot 27 to concurrently move upward in the slot 26 -01 ?the .link '24 without, however, a'lfecting said link. If the expansive movement of the bellows is sufficient to bring the pivot 27 to the upper end of the slot and continuesbeyond'this point, orin other words, if. the exerted pressure is greater than 60 m. in. of mercury, said pivot 27 will exert an upward pressure upon the link V This pressure will be communicated tothe memher-.21, .whiclrbeing in rigid connection with the indicating hand 16 will thus cause the latter to swingsalong the scale '31 toward the right in "the illustrated example. As

the :pressure in the bellowsi9 fluctuates, or

increases and decreases, the '-lia1id. 516 'will a1I10\6 correspondingly backward and forward along the scale 31 thus indicating the pressure-of the :blood and *the pulsations. The movement of the hand 16 fromany'posi- =tiononthescalebetween 60-and 260 toward the left is caused by the action of the counter-weight '19. ":In other words said counter-weight causes the link2-l to follow any downward movement-of the pivot 97 due :to-a contraction of the bellows. This operation continues until the pressure becomes lGSSJthHII GO mam. o fmercurywhereupon the hand .16 is again supported by *the stud 31 :while the pivot 27 moves: down in the slot QG a-nd relatively to the link 24: as the bellows continues to 'move :toward its initial position. As the bellows contracts rthe'zero or correction hand'35 will swing back toward the designation 36 and, as long as the instrument is in correctworking order, will register with this designation when the bellowsrhasreached its normalposition. If .the :bellows has become stretched or expanded from "continuous use the hand will show this by not coming :back to the designation :86 :in ithe 'final'eposition .of said bellows.

In this 02155813116IlIlSlLl'LllIlGllbWlll have to be -re-adjnsted orotherwise the extent of error indicated :by themermhand '35 will have to :be taken. into i consideration 'in reading :the iinstrument on the scale 31.

sIn the preferred arrangement the distance between the pivotal connection 1412 and the spindle 37 is approximately twice great as the distance abetween "the epivotal connection 25. and the spindle 17. Vilith this a con- .struction the-indicating hand 16 will swing in an are approximately twice as great as the :arcin which the2hand'35 swings in any A givenoperation of the instrument in other words, when the iindicating hand mo ves :90

: degrees the 'zero hand will move :about 15 degrees.

The connection 25 between the 'link and theindicatinghand 16 may be adjusted by shifting' the adjusting member 21arelatively to theanemberrQO -.wherebya proper and accurate travel of said hand between the designations GO and 260 on the scale 31 is always assured. By bending, the arms 28 and let up or down the position of rest of a the hands 16 and 35 may be adjusted so as to properly register with the point 60 on the scale 31 and the designation 36 respectively.

All connections and joints may be relatively loose so that the possibility of binding or sticking of the parts is reduced to a minimum; all lost motion in said connection and joints is taken up by the counterweights 19 and 40. This absence of any tendency of the parts to bind makes the instrument very sensitive and very responsive to the slightest movement of the bellows in either direction.

My improved instrument is very simple in construction and efiicient in operation and may at all times be relied upon to give accurate readings.

Various changes in the specific form shown and described may be made within the scope of the claims without departing from the spirit of my invention.

I claim:

1. A blood pressure gage comprising in dicating mechanism, means whereby the operative condition of said indicating mechanism is indicated and devices connected with said indicating mechanismand said means,

said devices being adjustable independently of each other whereby the initial positions of said indicating mechanism and said means may be Varied.

2. A blood pressure gage comprising a scale, an indicating hand cooperating with said scale, means for actuating said indicat ing hand and means controlled by said actuating means and actuated thereby coincidentally with said indicating hand and operating independently of said scale whereby the operative condition of said actuating means is indicated.

3. A blood pressure gage comprising a scale, an indicating hand cooperating with said scale, a bellows operatively connected with said indicating hand for actuating same, and means controlled by said bellows and actuated thereby coincidentally with said indicating hand and operating inde pendently of said scale whereby the operative condition of said bellows is indicated.

4. A blood pressure gage comprising a scale, an indicating hand cooperating with said scale, a bellows operatively connected with said indicating hand, a correction hand operatively connected with said bellows and actuated coincidentally with said indicating hand and a fixed designation independent of said scale cooperatingwith said correction hand to indicate the operative condition of said bellows.

A blood pressure gage comprising a scale, an indicating hand cooperating therewith. a correction hand, a bellows, and members connected respectively with said indi cating and correction hands whereby both hands are coincidentally actuated, said mem bers being each adjustably connected with said bellows.

6. A blood pressure gage comprising a lower section, a casing of approximately quadrant form diverging upwardly from said section, a scale plate in said casing having a scale thereon, an indicating hand cooperating with said scale, actuating means within said lower section operatively connected with said indicating hand, a correctionhand within said casing, a connection from said actuating means to said correction hand and a fixed designation on said scale plate independent of the scale thereon and cooperating with said correction hand to indicate the ope "ative condition of said actuating means.

7. A blood pressure gage comprising a casing, a scale within said casing, an indicating hand cooperating with said scale, means movable in one dn'ection for actuating said hand relatively to said scale in one direction, a link connected with said inclicating hand and adjustably connected with said actuating means whereby the initial position of said hand relatively to said scale may be adjusted, and means for causin said hand to follow a movement of said actuating means in another direction.

8. A blood pressure gage comprising a casing, a scale within said casing, an indicating hand cooperating with said scale, actuating means within said casing, a link adjustably comiected with said actuating means and adjustably connected with said hand whereby the latter is operated in one direction and a counterweight carried by said adjustable connecting means whereby said hand is operated in the opposite direction.

9.'A blood pressure gage comprising a casing, a scale within said casing, an indieating hand cooperating with said scale, actuating means within said casing, a member adjustably connected with said hand, a

link pivotally connected at one end with said adjustable member and having a slot at its other end, an arm carried by said actuating means, a pivot member n10 able in said slot whereby said arm and said link are loosely connected with each other and a counterweight carried by said hand for moving it in a direction opposite to its operation by said actuating means.

10. A blood pressure gage comprising a casing, a scale plate therein having a scale produced on its surface, an indicating hand in said casing cooperating with said scale, a counterweight carried by said hand for moving it in one direction, a member adjustably connected with said hand, actuating means within said casing, a link pivotally connected at one end with said adjustable membeiu-and having a slot'atits other end, anaarm adjustably mounted :npon said actuating 'means, a pivot member movable in said slot whereby said link and arm are a loosely connected and said indicating hand is ope 'atedin theopposite direction, a correction hand in said casing a counterweight carried by said correction hand for moving it in one'direction, a second armadjustably mounted upon said actuatingsineans, a link pivotally connected with said correction hand and said second arm wherebysaid correctionhand is operated inthe oppositedirection and afixed designation on said scale plate cooperating with said-correction hand to indicate the operative condition of said actuating means.

11. A blood pressure gage comprising a casing, a scale plate in said casinghavinga scale-and a fixed designation independent of said scale produced on itssurface actuating meansin said casing, aniindicating hand cooperating with said scale, a correction hand cooperatmg with said fixed designation, and connections from said two hands to said actuating means whereby said two hands are coincidentally actuated and moved in opposite directions to indicatei'respectively the pressure exerted by said [actuating means and its operative condition.

12. A blood pressure gage comprising a casing, a scale platethereinhaving a scale produced upon its surface, an indicating hand in said casing cooperating with'said scale, a bellows for actuatingrsaid hand an arm carried bysaid bellows and inclined upwardly from a face thereof, a-link pivotally connected'with said hand and with said arm,

the inclination of thelatter being adjustable to different fixed j positions relatively to K said face of the bellows to adjust itheinitial position of said hand relatively 'to said scale.

13. A blood pressure gage comprising an indicating hand, acorrectionhand, said two hands being movable abouta commonaxis,

and means whereby said vtwo hands are coincidentally iaetuated to indicate respectively the pressure-and the operative condition of the. gage.

In testimony whereof I have hereunto set my hand.

Copies of this patent-maybe obtainedfonfive ce11ts-each, byaddressing-theCommissioner oii'atents, "Washington, D; G. 

